libstdc++
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00001 // Allocator traits -*- C++ -*- 00002 00003 // Copyright (C) 2011, 2012 Free Software Foundation, Inc. 00004 // 00005 // This file is part of the GNU ISO C++ Library. This library is free 00006 // software; you can redistribute it and/or modify it under the 00007 // terms of the GNU General Public License as published by the 00008 // Free Software Foundation; either version 3, or (at your option) 00009 // any later version. 00010 00011 // This library is distributed in the hope that it will be useful, 00012 // but WITHOUT ANY WARRANTY; without even the implied warranty of 00013 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00014 // GNU General Public License for more details. 00015 00016 // Under Section 7 of GPL version 3, you are granted additional 00017 // permissions described in the GCC Runtime Library Exception, version 00018 // 3.1, as published by the Free Software Foundation. 00019 00020 // You should have received a copy of the GNU General Public License and 00021 // a copy of the GCC Runtime Library Exception along with this program; 00022 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 00023 // <http://www.gnu.org/licenses/>. 00024 00025 /** @file ext/alloc_traits.h 00026 * This file is a GNU extension to the Standard C++ Library. 00027 */ 00028 00029 #ifndef _EXT_ALLOC_TRAITS_H 00030 #define _EXT_ALLOC_TRAITS_H 1 00031 00032 #pragma GCC system_header 00033 00034 #ifdef __GXX_EXPERIMENTAL_CXX0X__ 00035 # include <bits/alloc_traits.h> 00036 #else 00037 # include <bits/allocator.h> // for __alloc_swap 00038 #endif 00039 00040 namespace std _GLIBCXX_VISIBILITY(default) 00041 { 00042 _GLIBCXX_BEGIN_NAMESPACE_VERSION 00043 template<typename> struct allocator; 00044 _GLIBCXX_END_NAMESPACE_VERSION 00045 } // namespace 00046 00047 namespace __gnu_cxx _GLIBCXX_VISIBILITY(default) 00048 { 00049 _GLIBCXX_BEGIN_NAMESPACE_VERSION 00050 00051 #ifdef __GXX_EXPERIMENTAL_CXX0X__ 00052 template<typename _Alloc> 00053 struct __allocator_always_compares_equal 00054 { static const bool value = false; }; 00055 00056 template<typename _Alloc> 00057 const bool __allocator_always_compares_equal<_Alloc>::value; 00058 00059 template<typename _Tp> 00060 struct __allocator_always_compares_equal<std::allocator<_Tp>> 00061 { static const bool value = true; }; 00062 00063 template<typename _Tp> 00064 const bool __allocator_always_compares_equal<std::allocator<_Tp>>::value; 00065 00066 template<typename, typename> struct array_allocator; 00067 00068 template<typename _Tp, typename _Array> 00069 struct __allocator_always_compares_equal<array_allocator<_Tp, _Array>> 00070 { static const bool value = true; }; 00071 00072 template<typename _Tp, typename _Array> 00073 const bool 00074 __allocator_always_compares_equal<array_allocator<_Tp, _Array>>::value; 00075 00076 template<typename> struct mt_allocator; 00077 00078 template<typename _Tp> 00079 struct __allocator_always_compares_equal<mt_allocator<_Tp>> 00080 { static const bool value = true; }; 00081 00082 template<typename _Tp> 00083 const bool __allocator_always_compares_equal<mt_allocator<_Tp>>::value; 00084 00085 template<typename> struct new_allocator; 00086 00087 template<typename _Tp> 00088 struct __allocator_always_compares_equal<new_allocator<_Tp>> 00089 { static const bool value = true; }; 00090 00091 template<typename _Tp> 00092 const bool __allocator_always_compares_equal<new_allocator<_Tp>>::value; 00093 00094 template<typename> struct pool_allocator; 00095 00096 template<typename _Tp> 00097 struct __allocator_always_compares_equal<pool_allocator<_Tp>> 00098 { static const bool value = true; }; 00099 00100 template<typename _Tp> 00101 const bool __allocator_always_compares_equal<pool_allocator<_Tp>>::value; 00102 #endif 00103 00104 /** 00105 * @brief Uniform interface to C++98 and C++0x allocators. 00106 * @ingroup allocators 00107 */ 00108 template<typename _Alloc> 00109 struct __alloc_traits 00110 #ifdef __GXX_EXPERIMENTAL_CXX0X__ 00111 : std::allocator_traits<_Alloc> 00112 #endif 00113 { 00114 typedef _Alloc allocator_type; 00115 #ifdef __GXX_EXPERIMENTAL_CXX0X__ 00116 typedef std::allocator_traits<_Alloc> _Base_type; 00117 typedef typename _Base_type::value_type value_type; 00118 typedef typename _Base_type::pointer pointer; 00119 typedef typename _Base_type::const_pointer const_pointer; 00120 typedef typename _Base_type::size_type size_type; 00121 // C++0x allocators do not define reference or const_reference 00122 typedef value_type& reference; 00123 typedef const value_type& const_reference; 00124 using _Base_type::allocate; 00125 using _Base_type::deallocate; 00126 using _Base_type::construct; 00127 using _Base_type::destroy; 00128 using _Base_type::max_size; 00129 00130 private: 00131 template<typename _Ptr> 00132 struct __is_custom_pointer 00133 : std::integral_constant<bool, std::is_same<pointer, _Ptr>::value 00134 && !std::is_pointer<_Ptr>::value> 00135 { }; 00136 00137 public: 00138 // overload construct for non-standard pointer types 00139 template<typename _Ptr, typename... _Args> 00140 static typename std::enable_if<__is_custom_pointer<_Ptr>::value>::type 00141 construct(_Alloc& __a, _Ptr __p, _Args&&... __args) 00142 { 00143 _Base_type::construct(__a, std::addressof(*__p), 00144 std::forward<_Args>(__args)...); 00145 } 00146 00147 // overload destroy for non-standard pointer types 00148 template<typename _Ptr> 00149 static typename std::enable_if<__is_custom_pointer<_Ptr>::value>::type 00150 destroy(_Alloc& __a, _Ptr __p) 00151 { _Base_type::destroy(__a, std::addressof(*__p)); } 00152 00153 static _Alloc _S_select_on_copy(const _Alloc& __a) 00154 { return _Base_type::select_on_container_copy_construction(__a); } 00155 00156 static void _S_on_swap(_Alloc& __a, _Alloc& __b) 00157 { std::__alloc_on_swap(__a, __b); } 00158 00159 static constexpr bool _S_propagate_on_copy_assign() 00160 { return _Base_type::propagate_on_container_copy_assignment::value; } 00161 00162 static constexpr bool _S_propagate_on_move_assign() 00163 { return _Base_type::propagate_on_container_move_assignment::value; } 00164 00165 static constexpr bool _S_propagate_on_swap() 00166 { return _Base_type::propagate_on_container_swap::value; } 00167 00168 static constexpr bool _S_always_equal() 00169 { return __allocator_always_compares_equal<_Alloc>::value; } 00170 00171 static constexpr bool _S_nothrow_move() 00172 { return _S_propagate_on_move_assign() || _S_always_equal(); } 00173 00174 static constexpr bool _S_nothrow_swap() 00175 { 00176 using std::swap; 00177 return !_S_propagate_on_swap() 00178 || noexcept(swap(std::declval<_Alloc&>(), std::declval<_Alloc&>())); 00179 } 00180 00181 template<typename _Tp> 00182 struct rebind 00183 { typedef typename _Base_type::template rebind_alloc<_Tp> other; }; 00184 #else 00185 00186 typedef typename _Alloc::pointer pointer; 00187 typedef typename _Alloc::const_pointer const_pointer; 00188 typedef typename _Alloc::value_type value_type; 00189 typedef typename _Alloc::reference reference; 00190 typedef typename _Alloc::const_reference const_reference; 00191 typedef typename _Alloc::size_type size_type; 00192 00193 static pointer 00194 allocate(_Alloc& __a, size_type __n) 00195 { return __a.allocate(__n); } 00196 00197 static void deallocate(_Alloc& __a, pointer __p, size_type __n) 00198 { __a.deallocate(__p, __n); } 00199 00200 template<typename _Tp> 00201 static void construct(_Alloc& __a, pointer __p, const _Tp& __arg) 00202 { __a.construct(__p, __arg); } 00203 00204 static void destroy(_Alloc& __a, pointer __p) 00205 { __a.destroy(__p); } 00206 00207 static size_type max_size(const _Alloc& __a) 00208 { return __a.max_size(); } 00209 00210 static const _Alloc& _S_select_on_copy(const _Alloc& __a) { return __a; } 00211 00212 static void _S_on_swap(_Alloc& __a, _Alloc& __b) 00213 { 00214 // _GLIBCXX_RESOLVE_LIB_DEFECTS 00215 // 431. Swapping containers with unequal allocators. 00216 std::__alloc_swap<_Alloc>::_S_do_it(__a, __b); 00217 } 00218 00219 template<typename _Tp> 00220 struct rebind 00221 { typedef typename _Alloc::template rebind<_Tp>::other other; }; 00222 #endif 00223 }; 00224 00225 _GLIBCXX_END_NAMESPACE_VERSION 00226 } // namespace 00227 00228 #endif